Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
One year or less, amortized cost	$ 38,174	$ 42,598
Greater than one year and less than five years, amortized cost	24,086	17,858
Amortized Cost	62,260	60,456
One year or less, fair value	38,173	41,789
Greater than one year and less than five years, fair value	23,786	17,478
Total available-for-sale securities fair value	$ 61,959	$ 59,267